• Cart

Quick Ship
Expert Pick
SKU #: FPE-TL-LB7-LLY MPN #: FPE-TL-LB7-LLY

Fleece Allison Transmission Cooler Lines 01-10 GM 6.6L Duramax LB7/LLY

$289.99
Get 289 points in loyalty rewards
Description
Fix your leaking transmission lines with these heavy duty, high flow, flexible transmission lines. This kit comes complete with everything needed to get the job done right the first time. Please select your proper model year designation, as well as if you currently have an aftermarket radiator. For those running an aftermarket radiator, you will need to add the additional Setrab fittings for proper fitment.
Options

Enter your zip and we'll see if installation is available.

  • Request quotes from local installers at checkout
  • Compare options and choose the best fit for your install

Fix your leaking transmission lines with these heavy duty, high flow, flexible transmission lines. This kit comes complete with everything needed to get the job done right the first time.

Please select your proper model year designation, as well as if you currently have an aftermarket radiator. For those running an aftermarket radiator, you will need to add the additional Setrab fittings for proper fitment.

Manuals and Guides
Vehicle Fitment
2001-2010 6.6L GM Duramax|Allison Automatic Transmission
WARNING: Cancer & Reproductive Harm - P65Warnings.ca.gov
KIT CONTENTS:
  • Transmission Lines
  • (6) 7/8"-14 O-ring to -10AN fittings
  • (2) 3/4"-16 O-ring to -10AN fittings (LB7-LLY kit only)
  • (4) Black Zip Ties
  • (2)Concave washers
About Fleece Performance Engineering
Browse Fleece Performance Engineering Parts Online by Make, Model, and Year.

Fleece Performance Engineering is a customer-centric diesel performance company that specializes in the development and manufacturing of innovative and extremely forward-thinking products to improve upon the performance and reliability of your Cummins, Duramax, or Powerstroke. Originally operating from a shop on their family farm, they have now grown to a full-scale operation that excels in air and fuel-related components for light-duty diesel. A continuous focus on product quality and the creation of new design principles before the competition is what keeps Fleece Performance growing by leaps and bounds year after year and at the forefront of the winners circle. Many know Fleece for its line of Cheetah Turbos, PowerFlo Lift Pumps, and 10mm Stroker Pumps, but it goes far beyond! From the simple, yet widely popular exhaust manifold stud kits that eliminate the troublesome factory manifold hardware to full-blown race engines via their Freedom Racing Engines division, they are truly a "one-stop shop!" And no, Fleece isn't "just" for the hot rod diesel market, they've got kits and components for every level of diesel truck owner.

TIMELINE OF FLEECE PERFORMANCE ENGINEERING:
  • 2008: Fleece Performance Engineering was established in North Salem, IN by Brayden and Chase Fleece. Both had a passion for continuously innovating and improving upon products already on the market. Brayden's 2004.5 LLY Duramax became the test bed to develop the TurboBrake and Duramax Cheetah, while Chase's 2002 Cummins was one of the first Cummins pickups to integrate an Allison Transmission.
  • 2012: Fleece Performance upgrades both facility and location by relocating to Nitro Alley in Brownsburg, IN situated among some of the top racing leaders in the world.
  • 2014: Fleece Performance acquires the area's premier engine machine shop, Freedom Racing Engines. The acquisition enables Fleece Performance to expand the engine development program and product offerings. Today, Fleece Performance and Freedom Racing Engines build some of the most competitive engines in the industry.
  • 2018: Fleece Performance breaks ground on a new 75,000 sq. ft. facililty in Pittsboro, IN.
  • 2019: Fleece Performance and Freedom Racing Engines relocates to its new facility in Pittsboro, IN. The all new headquarters provides additional space for product development, production and work areas, assembly and testing, a larger warehouse, as well as four engine dynamometers, and two-story office space.
  • 2020: Fleece Performance receives ISO9001:2015 Certification.
  • 2021: Fleece Performance Engineering was voted as one of the Best Places to Work in Indiana by the Indiana Chamber of Commerce.
  • 2022: Fleece Performance Engineering was voted again as one of the Best Places to Work in Indiana by the Indiana Chamber of Commerce.

As always, if you have any questions about which Fleece turbo, fuel, engine, or other product is right for you, do not hesitate to give us a call and we would be happy to assist.

Video
DIESEL TALK | FLEECE ALLISON TRANSMISSION COOLER LINES!
Tired of dealing with leaking transmission lines? Upgrade to these heavy-duty, high-flow, flexible transmission lines designed to handle the heat, pressure, and abuse of real-world driving. Built for durability and improved flow, this kit helps keep your transmission running cooler and leak-free. Everything you need is included to get the job done right the first time, no guesswork, no piecing parts together.

Overall rating: 4.480769 / 5 from 52 reviews.

AI Generated Review Summary

The Fleece Allison Transmission Cooler Lines 01-10 Duramax are highly regarded for their excellent quality, perfect fit, and ease of installation. Customers appreciate the high-quality materials and the comprehensive kit that includes everything needed for a successful installation.

Summary topics

  • Line Quality: 30%
  • Product Fit: 15%
  • Overall Quality: 20%

Review topics: ["fit","instructions","quality","install","buy","lines","hose","cooler","help","transmission","leaks","friends","trans","upgrade"].

Review highlights

  • "The lines fit perfect."Amy F.
  • "Fit was great and the quality of the hoses is good, trans is running great"Brad G.
  • "Very good quality product, but lacks installation instructions."Jezel B.

Reviews

Websight wrong

"Your web sight match this product to my 2007 c5500 kodiak only to find out from fleece them self thier products are only up to one ton truck"

scott w. (1/5)

Good lines

"Nice lines kinda soft for my liking and lower pressure rating than I expected but lots of fittings"

Isaiah S. (5/5)

Best transmission lines

"These lines combine with the Ppe Cooler is the greatest combo I have found for keeping Transmission temps down and also between these lines and the Ppe Cooler there is a great bit of added fluid capacity which also is the reason they helped do it so much better"

James W. (5/5)

Wrong fitting

"Good quality two out of the three lines were perfect but the short line from radiator to cooler was sent with one 90 degree fitting and one straight fitting when should be 2 90s so was very tight and not correct and I’ve tried reaching out for the correct part with no response"

Gage e. (3/5)

Way Heavier Duty than Factory

"This is a great product. I have a lot more confidence This will last. Lower radiator hose is a bit of a struggle but nothing to major."

Dylan (5/5)

"Easy install grate product"

Avery (5/5)

Panty dropping tranny lines

"These lines keep the Allison under the truck and the Allison in the truck warm and wet. No leaks under the truck. 😎"

LUCAS A. (5/5)

exactly what I needed. *****

"exactly what I needed. *****"

George C. (5/5)

Great product

"Installed these myself. Instructions were very clear, and the lines fit perfect. 10/10"

Thomas J. (5/5)

Fit was great and the

"Fit was great and the quality of the hoses is good, trans is running great"

Brad G. (5/5)

Q&A

Will these bypass the factory recirculating valve?
Yes, these will.
Will these fit with the ppe aftermarket transmission cooler? For a 2006 lbz
The Fleece line kit includes 7/8"-14 O-ring to -10AN fittings, and the PPE cooler uses 7/8-14 fittings on the cooler. In theory they will work, but may not be a direct fit as intended.
I have an aftermarket transmission temp sensor in the line going to the cooler. Will I be able to use this with the new fleece lines?
You might want to look into an AN adapter that has an 1/8" NPT port in it that would go in-between the Fleece AN adapter and the transmission cooler. -Mark
Are these lines rated for extreme cold weather?
Technically no, they are going to be a standard line. Not specific for extreme cold weather. -Sands
Putting fleece Allison cooling lines,I have a 2001 lb7 stock radiator,looks like I have a large nut on the radiator cooling side,does this mean I need setrab fittings?
The factory radiator from what I remember is the same way. Look for a tag on the radiator for the manufacturer. Or take a fitting out and she what thread it is. That would tell you for sure. *sna*